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Available-for-Sale-Securities | 9 Months Ended
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Sep. 30, 2023
Debt Securities, Available-for-Sale [Abstract] |
Available-for-Sale-Securities | Available-for-Sale-Securities The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| September 30, 2023 |  | December 31, 2022
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate debt securities | $ | 28,828 |  |  | $ | — |  |  | $ | (16) |  |  | $ | 28,812 |  |  | $ | 44,308 |  |  | $ | — |  |  | $ | (17) |  |  | $ | 44,291 |
Commercial paper | 1,978 |  |  | — |  |  | — |  |  | 1,978 |  |  | 7,953 |  |  | — |  |  | — |  |  | 7,953 |
Money market funds | 13,572 |  |  | — |  |  | — |  |  | 13,572 |  |  | 4,871 |  |  | — |  |  | — |  |  | 4,871 |
Agency bonds | 1,987 |  |  | — |  |  | (1) |  |  | 1,986 |  |  | — |  |  | — |  |  | — |  |  | — |
Treasury bills | 3,996 |  |  | — |  |  | — |  |  | 3,996 |  |  | — |  |  | — |  |  | — |  |  | — |
Municipal debt securities | 725 |  |  | — |  |  | — |  |  | 725 |  |  | 7,626 |  |  | — |  |  | (1) |  |  | 7,625 |
Total | $ | 51,086 |  |  | $ | — |  |  | $ | (17) |  |  | $ | 51,069 |  |  | $ | 64,758 |  |  | $ | — |  |  | $ | (18) |  |  | $ | 64,740 |
Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale securities in our Consolidated Balance Sheets (in thousands):
| September 30, 2023 |  | December 31, 2022
Cash equivalents | $ | 29,103 |  |  | $ | 27,668 |
Marketable securities | 21,966 |  |  | 37,072 |
Total | $ | 51,069 |  |  | $ | 64,740 |
The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| September 30, 2023
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 51,086 |  |  | $ | 51,069 |
Greater than one year | — |  |  | — |
Total | $ | 51,086 |  |  | $ | 51,069 |

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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